1 /*
2  * MIT License
3  *
4  * Copyright (c) 2016-2017 Patrick Rudolph <siro@das-labor.org>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12 
13  * The above copyright notice and this permission notice shall be included in all
14  * copies or substantial portions of the Software.
15 
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22  * SOFTWARE.
23  *
24  * Based on x11/main.c.
25  *
26 */
27 #include <assert.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <string.h>
32 #include <limits.h>
33 #include <math.h>
34 #include <sys/time.h>
35 #include <unistd.h>
36 #include <time.h>
37 
38 #define RAWFB_RGBX_8888
39 #define NK_INCLUDE_FIXED_TYPES
40 #define NK_INCLUDE_STANDARD_IO
41 #define NK_INCLUDE_STANDARD_VARARGS
42 #define NK_INCLUDE_DEFAULT_ALLOCATOR
43 #define NK_IMPLEMENTATION
44 #define NK_XLIBSHM_IMPLEMENTATION
45 #define NK_RAWFB_IMPLEMENTATION
46 #define NK_INCLUDE_FONT_BAKING
47 #define NK_INCLUDE_DEFAULT_FONT
48 #define NK_INCLUDE_SOFTWARE_FONT
49 
50 #include "../../nuklear.h"
51 #include "nuklear_rawfb.h"
52 #include "nuklear_xlib.h"
53 
54 #define DTIME           20
55 #define WINDOW_WIDTH    800
56 #define WINDOW_HEIGHT   600
57 
58 #define UNUSED(a) (void)a
59 #define MIN(a,b) ((a) < (b) ? (a) : (b))
60 #define MAX(a,b) ((a) < (b) ? (b) : (a))
61 #define LEN(a) (sizeof(a)/sizeof(a)[0])
62 
63 typedef struct XWindow XWindow;
64 struct XWindow {
65     Display *dpy;
66     Window root;
67     Visual *vis;
68     Colormap cmap;
69     XWindowAttributes attr;
70     XSetWindowAttributes swa;
71     Window win;
72     int screen;
73     unsigned int width;
74     unsigned int height;
75 };
76 
77 static void
die(const char * fmt,...)78 die(const char *fmt, ...)
79 {
80     va_list ap;
81     va_start(ap, fmt);
82     vfprintf(stderr, fmt, ap);
83     va_end(ap);
84     fputs("\n", stderr);
85     exit(EXIT_FAILURE);
86 }
87 
88 static long
timestamp(void)89 timestamp(void)
90 {
91     struct timeval tv;
92     if (gettimeofday(&tv, NULL) < 0) return 0;
93     return (long)((long)tv.tv_sec * 1000 + (long)tv.tv_usec/1000);
94 }
95 
96 static void
sleep_for(long t)97 sleep_for(long t)
98 {
99     struct timespec req;
100     const time_t sec = (int)(t/1000);
101     const long ms = t - (sec * 1000);
102     req.tv_sec = sec;
103     req.tv_nsec = ms * 1000000L;
104     while(-1 == nanosleep(&req, &req));
105 }
106 
107 /* ===============================================================
108  *
109  *                          EXAMPLE
110  *
111  * ===============================================================*/
112 /* This are some code examples to provide a small overview of what can be
113  * done with this library. To try out an example uncomment the defines */
114 /*#define INCLUDE_ALL */
115 /*#define INCLUDE_STYLE */
116 /*#define INCLUDE_CALCULATOR */
117 /*#define INCLUDE_OVERVIEW */
118 /*#define INCLUDE_NODE_EDITOR */
119 
120 #ifdef INCLUDE_ALL
121   #define INCLUDE_STYLE
122   #define INCLUDE_CALCULATOR
123   #define INCLUDE_OVERVIEW
124   #define INCLUDE_NODE_EDITOR
125 #endif
126 
127 #ifdef INCLUDE_STYLE
128   #include "../style.c"
129 #endif
130 #ifdef INCLUDE_CALCULATOR
131   #include "../calculator.c"
132 #endif
133 #ifdef INCLUDE_OVERVIEW
134   #include "../overview.c"
135 #endif
136 #ifdef INCLUDE_NODE_EDITOR
137   #include "../node_editor.c"
138 #endif
139 
140 /* ===============================================================
141  *
142  *                          DEMO
143  *
144  * ===============================================================*/
145 int
main(void)146 main(void)
147 {
148     long dt;
149     long started;
150     int running = 1;
151     int status;
152     XWindow xw;
153     struct rawfb_context *rawfb;
154     void *fb = NULL;
155     unsigned char tex_scratch[512 * 512];
156 
157     /* X11 */
158     memset(&xw, 0, sizeof xw);
159     xw.dpy = XOpenDisplay(NULL);
160     if (!xw.dpy) die("Could not open a display; perhaps $DISPLAY is not set?");
161 
162     xw.root = DefaultRootWindow(xw.dpy);
163     xw.screen = XDefaultScreen(xw.dpy);
164     xw.vis = XDefaultVisual(xw.dpy, xw.screen);
165     xw.cmap = XCreateColormap(xw.dpy,xw.root,xw.vis,AllocNone);
166     xw.swa.colormap = xw.cmap;
167     xw.swa.event_mask =
168         ExposureMask | KeyPressMask | KeyReleaseMask |
169         ButtonPress | ButtonReleaseMask| ButtonMotionMask |
170         Button1MotionMask | Button3MotionMask | Button4MotionMask | Button5MotionMask|
171         PointerMotionMask | KeymapStateMask | EnterWindowMask | LeaveWindowMask;
172     xw.win = XCreateWindow(xw.dpy, xw.root, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, 0,
173         XDefaultDepth(xw.dpy, xw.screen), InputOutput,
174         xw.vis, CWEventMask | CWColormap, &xw.swa);
175 
176     XStoreName(xw.dpy, xw.win, "X11");
177     XMapWindow(xw.dpy, xw.win);
178     XGetWindowAttributes(xw.dpy, xw.win, &xw.attr);
179     xw.width = (unsigned int)xw.attr.width;
180     xw.height = (unsigned int)xw.attr.height;
181 
182     /* Framebuffer emulator */
183     status = nk_xlib_init(xw.dpy, xw.vis, xw.screen, xw.win, xw.width, xw.height, &fb);
184     if (!status || !fb)
185         return 0;
186 
187     /* GUI */
188     rawfb = nk_rawfb_init(fb, tex_scratch, xw.width, xw.height, xw.width * 4);
189     if (!rawfb) running = 0;
190 
191     #ifdef INCLUDE_STYLE
192     /*set_style(ctx, THEME_WHITE);*/
193     /*set_style(ctx, THEME_RED);*/
194     /*set_style(ctx, THEME_BLUE);*/
195     /*set_style(ctx, THEME_DARK);*/
196     #endif
197 
198     while (running) {
199         /* Input */
200         XEvent evt;
201         started = timestamp();
202         nk_input_begin(&rawfb->ctx);
203         while (XCheckWindowEvent(xw.dpy, xw.win, xw.swa.event_mask, &evt)) {
204             if (XFilterEvent(&evt, xw.win)) continue;
205             nk_xlib_handle_event(xw.dpy, xw.screen, xw.win, &evt, rawfb);
206         }
207         nk_input_end(&rawfb->ctx);
208 
209         /* GUI */
210         if (nk_begin(&rawfb->ctx, "Demo", nk_rect(50, 50, 200, 200),
211             NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|
212             NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE)) {
213             enum {EASY, HARD};
214             static int op = EASY;
215             static int property = 20;
216 
217             nk_layout_row_static(&rawfb->ctx, 30, 80, 1);
218             if (nk_button_label(&rawfb->ctx, "button"))
219                 fprintf(stdout, "button pressed\n");
220             nk_layout_row_dynamic(&rawfb->ctx, 30, 2);
221             if (nk_option_label(&rawfb->ctx, "easy", op == EASY)) op = EASY;
222             if (nk_option_label(&rawfb->ctx, "hard", op == HARD)) op = HARD;
223             nk_layout_row_dynamic(&rawfb->ctx, 25, 1);
224             nk_property_int(&rawfb->ctx, "Compression:", 0, &property, 100, 10, 1);
225         }
226         nk_end(&rawfb->ctx);
227         if (nk_window_is_closed(&rawfb->ctx, "Demo")) break;
228 
229         /* -------------- EXAMPLES ---------------- */
230         #ifdef INCLUDE_CALCULATOR
231           calculator(ctx);
232         #endif
233         #ifdef INCLUDE_OVERVIEW
234           overview(ctx);
235         #endif
236         #ifdef INCLUDE_NODE_EDITOR
237           node_editor(ctx);
238         #endif
239         /* ----------------------------------------- */
240 
241         /* Draw framebuffer */
242         nk_rawfb_render(rawfb, nk_rgb(30,30,30), 1);
243 
244         /* Emulate framebuffer */
245         XClearWindow(xw.dpy, xw.win);
246         nk_xlib_render(xw.win);
247         XFlush(xw.dpy);
248 
249         /* Timing */
250         dt = timestamp() - started;
251         if (dt < DTIME)
252             sleep_for(DTIME - dt);
253     }
254 
255     nk_rawfb_shutdown(rawfb);
256     nk_xlib_shutdown();
257     XUnmapWindow(xw.dpy, xw.win);
258     XFreeColormap(xw.dpy, xw.cmap);
259     XDestroyWindow(xw.dpy, xw.win);
260     XCloseDisplay(xw.dpy);
261     return 0;
262 }
263 
264